Airplane



FIG. 1 is a perspective view of an airplane embodying my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof, illustrating the side not shown in FIG. 1;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a rear elevational view. 

The ornamental design for an airplane, substantially as shown. 